thatcher



(No Model.)

J. M. THATOHER.

5 Sheets-Sheet 1.

FIRE GRATE FOR FURNACES AND STOVES.

Patented Apr. 6, 1886.

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ATTORNEY (No Model.) 5 Sheets-Sheet 2.

J. M. THATGHER.

FIRE GRATE FOR FURNACES AND STOVES.

No. 339,235. Patented Apr. 6, 1886.

N. PETERS, Pfiulo'LMographer, WishinginrL D C 5 Sheets-Sheet 3.

J. M. THATGHER.

FIRE GRATE FOB. FURNACES AND STOVES,

(No Model.)

Patented Apr. 6, 1886.

Equi'e 6'.

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n. PETERS. PhmH-Nngnpher. wnmn m. n a

5 Sheets-Sheet 4.

B H O T A H T M m: NW7 m M m FIRE GRATB FOR FURNACES AND STOVE'S. No. 339,235.

Patented Apr. 6, 1886.

N. PrrERs, Pholtrmlvagrapber, wmm nun, 0. ii

(No Model.) 5 Sheets-Sheet 5.

J. M. THATOHER.

FIRE GRATE FOR FURNACES AND STOVES.

No. 339,235. Patented Apr. 6, 1886.

N. PETERS. "WW-WWW. Wulu'ngtm D. C.

Unwra STATES PATENT @rrrcn.

JOHN llLTHATCHER, OF BROOKLYN, NEW YORK.

FlRE-GRATE FOR FURNACES AND STOVES.

SPECIFICATION forming part of Letters Patent No. 339,235, dated April 6, 1886.

Application filed February 21, 1884. Serial No. 121,557. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN M. THATGHER, the city of Brooklyn, county of Kings, and State of New York, have invented new and useful Improvements in FireGrates for Furnaces and Stoves, which improvements are fully set forth in the following specification.

This invention relates more particularly to fire-grates for hotair furnaces, but is not limited to them, being applicable to stoves and furnaces generally.

It consists in the combination, with an ashpit having an open front of full width and provided with ledges, ofa fire-pot, a conical gratesection, and a fire-bed, said conical grate-section and fire-bed being supported on the ledges in the ash-pit, and being movable thereon independently of said fire'pot.

The principal object of the combination is to facilitate the renewal of the fire-grate or of the parts thereof, (that is, the conical section and the fire-bed, which together make up the fire-grate.) Vith the construction claimed this can easily be done by sliding the firegrate or either part thereof out at the front of the ashpit. The conical grate-section and the firebed may be supported upon separate ledges, so that either can be slid in or out independently of the other, or they can be supported upon one setof ledges, so as to he slid in and out together. Both forms will be shown herein.

The invention further comprises other combinations, hereinafter set forth.

In the accompanying drawings, Figures 1 to 12 illustrate that form of the invention which is considered best adapted to use in large hotair furnaces or stoves. Fig. 1 is a partial view in vertical section lengthwise of the ash-pit of a hot-air furnace provided with theimproved grate; Fig. 2, a vertical section through the grate and fire-pot in aplane at right angles to that of Fig. 1; Fig. 8, a horizontal section on line 20 w, Fig. 1; and Fig. 4., a horizontal sec-- tion on linear, Fig. 1. Fig. is a detail view in vertical section on line 2 2, Fig. 3; Fig. 6, a bottom view of the conical grate-section Fig. 7, a plan of the frame supporting said section; Fig. 8, a horizontal section on line y 3/, Fig. 1; Fig. 9, a bottom view of the firebed; Fig. 10, a bottom view of the fire-bed and dumping-center and the supporting-frame connected with one another and arranged in the position which they occupy when in use; Fig. 11, a plan of the frame for supporting the fire'bed, the dumpingcenter being shown in place; and Fig. 12, a detail view in section on line 2 a, Fig. 10. Figs. 13, 14c, and 15 are views corresponding to Figs. 1, 4, and 8, respectively, showing the form of grate best adapted to smaller stoves or furnaces; and Figs. 16, 17, and 18 show details in construction, Figs. 16 and 18 being views in plan, and Fig. 17 a bottom view. Fig. 19 is a bottom view of the fire-bed somewhat modified from that shown in Fig. 17. Fig. 20 is a partial view in sectional elevation,illustrating a modification in the means for supporting the conical gratesection.

The same letters indicate like parts on all the figures.

A is the fire-pot; B, the ash-pit; C, the conical grate-section; D, the lire-bed, and E the dumping-center.

The lirepot A is supported on top of the ash-pit B, its lower edge resting upon the ledge a within the rim 1). The conical grate-section O is supported immediately below the fire-pot, its interior diameter at the top being equal to that of the fire-pot. It is provided at the top with an exterior peripheral lip, c, which projects under the ledge a, nearly or quite in contact with the under surface of the latter. In the form of apparatus shown in Figs. 1 to 12 the grate is supported by this lip c. It rests upon the frame F, which in turn is supported by the flanges or ledges d on the walls of the ash-pit. The bottom of the lip c is grooved, as shown at c.

l The frame F is provided in its inner surface with pocketsf, and anti-friction balls g are placed between thelip c and frame F, being held in place by the groove and the pockets.

By means of a handle, It, which extends to the front of the ash-pit,thegrateseetion C may be turned back and forth to shake down the fire. The full width of the ash-pit is extended to the front, (see Fig. 4,) and whenever it is desired to remove the conical grate-section it can be slid forward on theledges or flanges d.

Below the mouth or contracted lower part of the grate-section O is the fire-bed D. It is a circular plate of somewhat greater diameter than the mouth of the grate. It is sup-' ported on the frame G. Antifriction balls 2' are placed under the fire-bed in pockets 7c of the frame G, the tops of the balls extending into the groove Z in the bottom of the fire-bed. A rim, m, on the bottom of the fire-bed fits in a circular opening in the frame G and acts as a swivel-pin.

Instead of relying wholly upon the weight of the fire to hold the fire-bed in place, a number of fingers, n, (see Figs. 10 and 12,.) fastened to the fire-bed by screws (or it may be by other means) and projecting under the center of frame G, are provided to insure against accidental displacement. The fire-bed can be turned to shake down the fire by means of a handle, p. The middle of the fire-bed is re moved,and below the opening is the dumpingcenter E. This is fastened to the frame G by a screw, (1, upon which it may be turned. It

is moved into the position shown in dotted lines, Fig. 10, whenever it is desired to draw the fire. \Vhen the center is in place, the edge opposite the swivel-screw q rests upon and is supported by the projection r of the frame G.

The frame G is upheld by the ledges s on the walls of the ash-pit. It can be removed, together with the fire-bed and dumping center, in the same manner as the grate-section O. The ledges s,which uphold the fire-bed D and its supporting-frame G, are below the ledges dconsiderably more than the depth of the gratesection C, so that the latter does not come down to the fire-bed. A free space is thus left between the two parts of the grate. It will be understood that the height of this space need not be always the same; but for practical purposes it is well to have it bear substantially the proportions shown. At all events it should be sufficient to enable the cinder, slag, and ashes to be sliced, broken up, and withdrawn without being large enough for the coals to drop out over the edge of the fire-bed. The fire is fed through the door H.

The operation will be sufficiently understood from the description given.

Referring to Figs. 13 to 18, the gratesection, instead of being suspended by the lip c, is supported by the uprights 1 on the fire-bed D. The top of each upright is notched, and into the notches fit the pins or projections 2 on the conical gratesection.

It is evident that instead of having the grate-section supported upon the uprights 1, fastened at the bottom to the fire-bed, the said fire-bed could be provided with legs or depending projections similar to said uprights, but which would be fastened at the top to the grate-section and rest at the bottom upon the fire-bed, as shown for the leg 25 in Fig. 20.

The supporting-frame G is provided with a rim, 3, aroundthe central opening. The antifriction balls i, Figs. 13 and 17, or the projections 6, Fig. 19, roll or slide upon the horizontal part of the frame surrounding this rim. The balls 2' are confined in 'pockets l on the under side of the fire-bed. The front part, 5, of the fire-bed is depressed below the level of the general surface, so as to form a groove or recess. In this groove orrecess slides a plate, E, which constitutes the dumping-center. The rear end of the plate runs under the rear portion, 6, of the fire-bed, but at the front the plate E is made thicker, so that its surface is on a level with the general surface of the firebed.

Under the plate E, at the edges, are fastened the bearing-strips 7, which rest and slide upon tl e depressed part of the plate 0, forming the fire-bed. This depressed part 0 rests upon the front of the rim 3, which is lower than the back. The projections or ledges 8 form stops to limit the play of the fire-bed. The handle 9 serves the double purpose of shaking the grate and withdrawing the dumping-center.

- It is evident that the grate-section 0 could be supported, in the manner shown in Figs. 13 to 15, upon a fire-bed supported as shown in Figs. 1 to 12, and also that the fire-bed with dumping-center (shown in Figs. 13 to 18) could be used with a grate independently supported.

In Figs. 1 and 3 a portion of the aiuheating part of the furnace is shown, but this only incidentally, and not as included in the invention. As shown it embodies certain improvements in air -heating furnaces which form the subject of a separate application of even date herewith, ofiicially'numbered 121,519. The present improvements may be used, however, with any ordinary or suitable air-heating means, or in domestic heating ap-' paratus generally of whatever description.

Modifications may be made in the details without departing from the spirit of the invention and parts of the invention may be used separately.

Having now fully described my said invention and the manner of carrying the sameinto effect, what I claim is- 1. The combination, with an ash-pit having an open front of full width and provided with ledges, of a fire-pot, a conical gratesection, and a fire-bed, said conical gratesection and fire-bed being supported on the ledges in the ash-pit,'aud being movable thereon independently of said fire-pot, substantially as described.

2. The combination, with the ash-pit, of a conical grate-section, a fire-bed, and a supporting frame or frames upheld by ledges or flanges on the walls of the ash-pit, said ashpit having an open front of full width, so that the parts-supported on said ledges can be moved laterally or horizontally out of said ash-pit, substantially as described.

3. The combination of the fire-pot, ash-pit, I specification in the presence of two subscribconical grate-section, fire-bed, dumping-cen- 1 ing witnesses. ter, supporting frame or frames, and the ledges or flanges on the walls of the ash-pit for i 5 upholding said supporting frame or frames, Witnesses:

substantially as described. R. A. PIPER,

In testimony whereof I have signed this 1 JOHN MCOLURE.

JOHN M. THATCHER. 

